25ec2-userdata

#!/usr/bin/python
# Author: Alon Swartz <alon@turnkeylinux.org>

import os
import sys

if '_TURNKEY_INIT' in os.environ:
    sys.exit(0)

import tempfile

import executil
import ec2metadata

class TempFile(file):
    def __init__(self, prefix='tmp', suffix=''):
        fd, path = tempfile.mkstemp(suffix, prefix)
        os.close(fd)
        self.path = path
        self.pid = os.getpid()
        file.__init__(self, path, "w")

    def __del__(self):
        if self.pid == os.getpid():
            os.remove(self.path)

def main():
    userdata = ec2metadata.get('user-data')

    if userdata and userdata.startswith("#!"):
        fh = TempFile(prefix="ec2userdata")
        fh.writelines(userdata)
        fh.close()

        os.chmod(fh.path, 0750)
        executil.system(fh.path)
        print "# executed ec2 user-data script"

if __name__ == "__main__":
    main()